Update GeoFire.podspec to dep on Database 4.0
Update GeoFire.podspec to dep on Database 4.0
victoraliss0n/geofire-objc,victoraliss0n/geofire-objc,firebase/geofire-objc,firebase/geofire-objc,firebase/geofire-objc,victoraliss0n/geofire-objc,firebase/geofire-objc